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Biology · 2023 · 2 marks
CBSE 2023 · Region 1 · Set 3 · Q21
The diagram given below shows a developmental stage of human embryo. Answer the following questions with reference to it: (a) Identify and name the…
The diagram given below shows a developmental stage of human embryo. Answer the following questions with reference to it :
(a)
Identify and name the human embryonic stage shown.
(b)
Mention its exact location in the normal pregnancy of a woman.
(c)
Write one function of each of the two parts labelled 'X' and 'Y'.
Marking-scheme solution
(a) Blastocyst
(b) Uterine wall/endometrium/innermost layer of uterine wall.
(c) (Outer layer/trophoblast) 'X'- helps in implantation in uterus/attachment to endometrium.
(Inner cell mass) 'Y'- gets differentiated into embryo.All Human Reproduction questions2023 question paperNCERT solutions: Human ReproductionPractice Human Reproduction →
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CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.